Why does the validator show in the validator and validator summary

Question

I have a validator and validation on my page.

When this happens, this page is invalid, the text appears on the validator itself and in the check summary.

What's wrong?

 <asp:RegularExpressionValidator ValidationGroup="Register" CssClass="validator" ForeColor="black" 
                                    ControlToValidate="txtRegisterEmail" ID="valMail" runat="server" 
                                    ValidationExpression=".*@.*\.(com|net|org|edu|mil|at?|de?|ch?|uk?)$" 
                                    ErrorMessage="Bitte geben Sie eine gültige EMail-Adresse ein." 
                                     EnableClientScript="false" 
                                    Display="Dynamic"></asp:RegularExpressionValidator>


 <asp:LinkButton CausesValidation="true" ValidationGroup="Register" ID="linkRegister" CssClass="linkWhite" runat="server" 
                                    onclick="linkRegister_Click">Jetzt Registrieren</asp:LinkButton><br />
                                    <br />
                                <asp:ValidationSummary ValidationGroup="Register" ID="sumRegister" runat="server" 
                                HeaderText="Folgende Fehler sind aufgetreten:"  CssClass="validator" 
                                ShowSummary="true" DisplayMode="BulletList" />

Answer 1

That by design you are not doing anything wrong.

If you want the validation message to appear only in the summary, you can set the Display property of your validator control None.

, , ValidationGroup, ValidationSummary .

Answer 2

( "dynamic">):

<asp:RegularExpressionValidator 
    ValidationGroup="Register" CssClass="validator" ForeColor="black" 
    ControlToValidate="txtRegisterEmail" ID="valMail" runat="server" 
    ValidationExpression=".*@.*\.(com|net|org|edu|mil|at?|de?|ch?|uk?)$" 
    ErrorMessage="Bitte geben Sie eine gültige EMail-Adresse ein." 
    EnableClientScript="false" 
    Display="Dynamic">*</asp:RegularExpressionValidator>

, . () , , " " , .